Jack



Dec. 6, 1949 J. D. GENIER ET AL J ACK Filed Dec Q WM VW JOHN D. GENIER JOHN L. RUQKART Patented Dec. 6, 1949 John D.

Genier, South Norfolk, and John L.

V Ruckart, Portsmouth, Va. Application December 10, 1945, Serial No. 634,125 3 Claims. (01. 254-100) (Granted under the a 1 amended April 30,

This invention relates to a screw-operated jack especially designed for straightening the deck plates of a ship.

In ship building, a common type of weather deck structure involves the securing to a relatively thin steel deck plate of such items as the securing tracks used on the decks of aircraft carriers. The usual deck structure involves a plurality of longitudinal deck beams supporting the deck plating. Since the deck plating is comparatively thin, and for other reason-s, it is very likely to sag in the spaces between the beams. When it is desired to weld to the plating a member crossing the beams at an angle (for example, the securing tracks above mentioned) it is necessary to raise the sagging portion of the plate so that welding may be accomplished. The generally followed method involves tacking yokes to the plating and by means of stiffener beams and turnbolts or some similar arrangement to pull the plating up flush with the member.

The method described results in marring and damaging the plating and involves much welding and chipping at the expense of many man-hours of labor. The device described herein although not limited to use in the above described situation, is especially designed to avoid some of the disadvantages referred to and others encountered in the normal procedures.

The main object of the invention is to provide a jack for pushing the sagging deck plating up from below, thus totally avoiding temporary weldments attached to the upper surface of such plating.

A second object of the invention is to provide a simple form of jack constructed so as to supply a force between the plating and the flanges of the longitudinal beams supporting the plating, and to raise the plate up into alignment with the portions directly over the beams.

Figure 1 is a side view of the device shown in actual use.

Figure 2 is an end view of the jack only.

The jack comprises a lower bar I of a length suitable to the distance between the longitudinal beams supporting the deck and is to be supported by the projecting flanges of the beams which are usually of the I section. Threaded into the lower bar are shown two rods 2 having off-set crank handles 3 on their lower ends. A second bar 4 is movably supported by the two rods and four side plates 5 slotted at their lower end-s to slide over bolts 6 in the lower bar. Sockets I receive the rods 2. As will be obvious, with the lower bar in place between the two adjacent longitudinal of March 3, 1883, as

beams, the upper bar may be raised by means of the threaded rods to push the deck plating up into line as shown, from the position indicated by dotted lines showing its sagged position. With the plating thus pushed up, welding of the transverse securing track may proceed without obstruction by a deck-raising device secured to its upper side. As soon as welding is completed the jack may be collapsed and moved to a second location for repetition of the operation.

The device is shown, and may well be, constructed of scrap pieces of channel or angle iron, pipe, plate, etc. It is very simple, eiiective, easy of construction, and sure in operation. Since the upper bar extends practically from beam to beam it will not require close attention to avoid raising the plating so much as to cause it to bulge above the portion-s secured tothe beams. Numerous minor changes in construction will occur to any competent mechanic.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

We claim:

1. A jack for raising the sagging portion of deck plating supported by flanged beams, comprising a unitary structure having a first bar adapted to extend between adjacent beams and be supported by the flanges thereof, a second bar of a length to clear the beam flanges and disposed substantially parallel to the first bar, slotted plates rigidly attached to the second bar and in slidable engagement with the first bar for maintaining the bars in substantially parallel relation to each other, a plurality of tubular guide-sockets on the lower side of the second bar, a plurality of screws threaded into the first bar and seated in the guide sockets, and crank handles for turning the screws whereby pressure may be applied through the screws to the second bar for straightening sagging deck plating.

2. A jack for raising the sagging portion of deck plating supported by flanged beams, comprising an assembled structure having a first bar adapted to extend between adjacent beams and be supported by the flanges thereof, a second bar of a length to clear the beam flanges and disposed substantially parallel to the first bar, slotted plates secured to the second bar, projections on the first bar fitted into the slotted plates to maintain the bars substantially parallel, a plurality of tubular guide socket-s on the lower side of the second bar, a plurality of female threaded 3 portions ,on the first bar, and crank handled screws in threaded engagement with the female threadedportions and seated in the sockets whereby pressure may be applied through the screws to the second bar for straightening sagging deck plating.

3. A jack for raising the sagging portion of deck plating supported by flanged beams, comprising an assembled structure having a first bar: adapted to extend between adjacent beams and be supported by the flanges thereof, a second barof a length to clear the beam flanges and dis posed substantially parallel to the first bar,r.slothted plates secured to the second bar, projections on the first bar fitted into the slottedplatesto maintain the bars substantially parallel, a plurality of tubular guide sockets on the lower side of the second bar, a plurality of female threadeda portions on the first bar, and screws in threaded engagement with the female portions, said screws having one of their end portions seated in said sockets and unitary crank handles on their outer ends whereby rotation of the crank handles turns the screws thus permitting pressure to be exerted on. the second banfor straightening sagging deck plates-"z JOHN D. GENIER.

JOHN L. RUCKART.

REFERENCES CITED The followingreferenoes are of record in the 'flle of' patent:

'UIII'I i L-D STATES PATENTS Number Name Date 1,243,118 Trivigino Oct. 16, 1917 1,973,346. Hughes Sept. 11, 1934 

